package cn.edu.scau.cmi.suwenpeng.chapter02;

public class Teacher {
	double a,b;
	 double add()
	 {
		 return a+b;
	 }
	 double sub()
	 {
		 if(a>=b)
			 return a-b;
		 else 
			 return b-a;
	 }

}
